Reservoir-pen.



No. 896,193. PATENT'BD AUG. 1a, 1908.

'H. s. BAKER. RESERVOIR PEN.- APPLIOATION FILED MAR. 23, 1906.

WITNESSES: INVENTOR m m I I @amo v I ATTORNEY resident of' 'Wilkinsburg,

. fiENRY s. BAKER,

or WILKINsBURG, PENNSYLVANIA.

RESERVOIR-PEN.

I .No. 896,193-

To all whom it may concern Be it known that I, HENRY S. BAKER, a subject of the King of Great Britain, and a in 'the countyof Allegheny and State of Pennsylvania, have invented a new and usefullmprovement in Reservoir-Pens, of which the following is a stances from the fluid specification. a

- My invention relates to pens or marking devices, and articularly to those having reservoir attac ments.

One object of my invention is to provide a device of the above specified character which shall insure the issuance from the pen point of just the proper amount of writing fluid at all times, regardless of temperature changes or other variable conditions. i

Another object of-myinvention is to pro vide a device having such structural characteristics that the removal of foreign submay be effected at a location remote from the pen'point, and thatshall provide storage capacityfor large quantities of fluid.

The single figure of the accompanying drawing is a longitudinal sectional view of a device that is constructed in accordance with my invention.-

A substantially hookshaped tube, the

ends of the longer and the shorter portions 1 and 2 ofwhich are closed and 0 en, re-

- communicates with while in engagement therewith. The p of the branch 3 is located above the sharp the level of which in the spectively, is provided with a branc 3 that the longer portion. The branch 3 is drawn to a very fine point at 4 so that the opening in its end will be very small, the point servin as a en by means of emade upon a may be moved point paper o r"other material that bend at-5' in the tube but below the open end- The longer portion of the tube is enla1 ged near its upper end in order to form a reservoirfor writmg fluid -6 with which the tube is filled when in use and shorter portion 2 is preferably below that ofthe point 4. When the. parts are arr'aned as s ecified the pres sure of the fluid wit in the branch 3 near the point 4 will be slightly below that exerted by the atmosphere and consequently the. fluid may be caused to issue from the point only by capillary action, such as occurs when a strip of paper is moved whileinengagement. wit the point. Since the degree of capillary Specification of'Letters Patenh' --a ucauon'mea-narchea, 106.-. Seria1NoI 307,7

the height to which it shaped tube, t

- attraction is diminished when the paper be- -Patented Aug. 18, mos.

' comes wet, as by reason of the overlapping of many marks, the-fluid will hot issue from the point in suflicient amounts to form drops or- ,blots uponv the paper, while the pen wlll operate regardless of the rate of relative Escape of v fluid from the point'4 and the entrance of air therethrough when the pen is not in service will be prevented by the minu-teness of the motion of the penand paper.

opening. A very fine line will be made also because'of the fineness of the pen point.

I With variations of temperature, the volume of air above the fluid in the larger portion of the tube will change, but this will have substantially no effect upon the rate of flow of fluid from the pen the fluid to rise and fall in the shorter por-- tion. As the fluid is used at the point 4, rises in the shorter portion 2 of the tube diminishes, and when the level of the fluid therein falls below the bend at 5 ai'r Willbe admitted to the longer portion, and level ofthe fluid will fall therein while it will rise in the shorter portion until equilibrium is restored, according to wellknown princ les.

because it merely causes The operation of'the device will not be disv turbed bythe presence of foreign substances in the fluid because, if such substances are of greater-specific gravity than the fluid, they will settle to the bottom of the hook or bend in the tube rather than enter'the branch 3,

while dust and other impurities that may collect upon the surface of the liquid in the shorter portion of the tubecannot'enter the longer portion. The period between the gs of the tube is greatly increased over pens that have heretofore-been provided because of the 'large'reservoir that is provided by the enlargement of the longer portion of the tube. I

My invention is especially adapted for use in recording measuring instruments in which it is necessary thatthe pen employed to record'the variations'inthe values of the forces loo measured upon a movable strip be absolutely reliable in operation and capable of. long use between fillings, but it is not necessarily limited ,to such specific service.

I claim as my invention:

1. A pen com rising a substantiallyhook l ie ends of the longer and shorter portions of which areres closed-and open, and a pen. point t municate's with the longer portion.

ectively at com- 2. A pen comprising a substantially hookshaped tube, theends of the longer and shorter portions of which are res ectively closed and open, and a pen point t at communicates with the longer portion and is located above the bend in the tube and below the end of the shorter portion.

3. A pen com rising a substantially hook.- shaped tube, t e ends of the longer and shorter portions of which are respectively closed and open, and a branch communicating with the longer portion and having an opening that is located above the bend in the tube and below the end of the shorter portion.

4. A pen com rising a substantially hookshaped tube, t e ends of the longer and shorter portions of which are respectively closed and open, and a branch that communicates with the longer portion and has a constricted opening.

5. A pen comprising a substantially hookshaped tube, the ends of the longer and shorter portions of which are closed and open respectively, and the longer portion of which is enlarged to form a receptacle, and a branch that communicates with the lon er portion and has an opening that is located above the bend in the tube and below the end of the shorter portion.

6. -A pen com rising a substantially hookshaped tube, -t e ends of the longer and shorter portions of which are closed and open respectively, and the longer portion of which is enlarged to'form a receptacle, and a branch that communicates with the longer portion and has a constricted openin 7. A substantially hook-siaped tube the ends of the longer and shorter portions of which are respectively closed and open, and

a branch communicating with the longer por 'tion and having a constricted opening, said tube being adapted to contain a bodyof-ink the level of which in the shorter portion is below the opening in the branch.

8. A fountain pen consisting of a glass tube having a body portion closed at one end and provided with two branches at its other end one of which extends alongside the body portion and has a fully open outer end and the other of which projects away from the body portion and has a constricted opening in its outer end.

9. A fountain pen consisting of a glass tube having a body portion closed at one end and provided at its other end with two branches one of which is substantially parallel with it and has a fully open end and the other of which projects at a substantially right angle and has a constricted opening in its outer end. j

10. A tubular fountain pen comprising a body portion closed at one end and having two branches at its other'end one of which projects toward the closed end of the body portion and has a fully open end and the other of which projects away from the body portion and has a constricted opening in its outer end.

In testimony whereof,- I have hereunto subscribed my name this 22nd day of March, 1906.

HENRY S. BAKER.

Witnesses:

WEsLEY G. CARR, Or'ro S. SCHAIRER. 

